Extend the LandscapeMixin

[dglmoore]

This pull request does the following:

• It removes any reference to LandscapeMixin internal variables from Network
• Creates the LandscapeMixin.landscape_data property
• Add basin entropy to LandscapeData
• Renames LandscapeMixin.__expound to LandscapeMixin.expound
• Creates the clear_landscape method (which resets the internal landscape data)
• Calls clear_landscape in the ECA and RewiredECA property setters
• Improves test coverage a smidge

[codecov-io]

Codecov Report

Merging #165 into master will increase coverage by 1.07%. The diff coverage is 98.86%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   87.34%   88.41%   +1.07%     
==========================================
  Files          16       16              
  Lines        1470     1485      +15     
==========================================
+ Hits         1284     1313      +29     
+ Misses        186      172      -14

Impacted Files	Coverage Δ
neet/network.py	64% <ø> (-0.29%)	:arrow_down:
neet/boolean/reca.py	82.64% <100%> (+0.29%)	:arrow_up:
neet/boolean/eca.py	97.14% <100%> (+0.08%)	:arrow_up:
neet/synchronous.py	97.69% <98.79%> (+6.91%)	:arrow_up:

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[hbsmith]

This looks great. I tried to include __landscaped in the Mixin class originally but I was doing it wrong. Thanks for properly setting up the clear and initialization for landscape.